Pencil sharpener



De@ 14, 1943 w. H. MCCAULEY; JR 2,336,558

PENCIL SIRPENERv Filed Feb. 1'?, 1945 CCC Patented Dec. 14, 1943 `UNITEDSTATES PATENT CFFICE PENCHL SHARPENER William H. McCauley, Jr.,Philadelphia, Pa. Application February 17, 1943, Serial No. 476,217

(Cl. 1Z0-87) Claims.

The present invention relates to new and useful improvements in pencilSharpeners and has for its primary object to provide, in a manner ashereinafter set forth, an article of this character which is adapted tobe expeditiously mounted and left permanently on a pencil until saidpencil has been used up, after which the sharpener may be convenientlytransferred to a new pencil.

Another very important object of the invention is to provide a pencilSharpener of the aforementioned character comprising a uniqueconstruction and arrangement of cutting elements.

Still another very important object of the invention is to provide aSharpener of the character described embodying novel means for rotatablysecuring the device on a pencil,

Other objects ci the invention are to provide a pencil sharpener of thecharacter set forth which will be comparatively simple in construction,strong, durable, highly eicient and reliable in use, compact, light inweight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of theinvention will become apparent from a study of the followingspecication, taken in connection with the accompanying drawing whereinlike characters of reference designate corresponding parts throughoutthe several views, and wherein- Figure l is a view in vertical sectionthrough a pencil Sharpener constructed in accordance with the presentinvention.

Figure 2 is a sectional View, taken substantially on the line 2 2 ofFigure 1.

Figure 3 is a detail View in elevation of the spiral sharpening member.

Referring now to the drawing in detail, it will be seen that theembodiment of the invention which has been illustrated comprises a coneof a suitable plastic material, which cone is designated by referencecharacter Il.

Embedded in the interior of the plastic cone I4 is a spiral metallicstrip I5. Cutting teeth I5 are stru-ck inwardly from the spiral stripI5, said teeth leaving openings Il in said strip. Tangential openings E3in the plastic cone I are aligned with the openings Il. This is shown inadvantage in Figure 2 or the drawing.

Fixed in the plastic cone I4 at the top of the spiral strip l5 is acylindrical ring I9. Struck inwar ly from the cylindrical ring IS is aspiral series of teeth 2! which are arranged alternately as seen inFigure 3 of the drawing for preventing retrograde rotation of the cone I4 on the pencil and for preventing said cone from slipping off saidpencil.

The tip portion 2| of the plastic cone It has formed therein a bore 22which accommodates the lead 3 of the pencil. A lead pointer or cutter 23is provided in the cone I4 at the lower end of the spiral strip I5.

In the use of the invention, the plastic cone i@ is applied to thewriting end of the pencil 2 and manually turned in a clockwisedirection. The teeth I6 cut or shave the end portion of the pencil, thecuttings or shavings passing out through the openings Il and i8, Thedogs 20 bite into the pencil for securing the cone Ill againstretrograde rotation and for preventing said cone from slipping off thepencil. As the sharpening progresses, the point or lead passes throughand projects from the bore 22.

lt is believed that the many advantages of a pencil Sharpenerconstructed in accordance with the present invention will be readilyunderstood, and although a preferred embodiment of the device is asillustrated and described, it is to be understood that changes in thedetails of construction may be resorted to which will fall within thescope of the invention as claimed.

Having described the invention, whatI claimed as new is:

1. A pencil Sharpener of the character described comprising a conerotatably engageable with the writing end portion of a pencil, a spiralseries of cutting teeth projecting tangentially into the cone forcutting the pencil upon rotation of said cone thereon, said cone havingopenings therein adjacent the teeth for the discharge of shavngs, acylindrical ring at the large end of the cone for the passage oi thepencil, and a spiral series of dogs struck inwardly fro-m the ring andadapted to bite into the pencil, certain of said dogs being arranged forpreventing retrograde rotation oi the cone on the pencil, the remainingdogs being arranged to secure the cone against slipping off the writingend of the pencil.-

2. A pencil Sharpener of the character described comprising a metalliccone rotatably engageable on the writing end portion of a pencil, saidcone comp-rising a tip including an inturned tube for the passage or"the lead of the pencil, pointing cutters for the lead adjacent the innerend of the sleeve, spiral series of teeth struck inwardly from the conefor cutting the pencil upon rotation of said cone thereon, said conehaving openings therein adjacent the teeth for the discharge ofshavings, a cylindrical ring on the large end of the cone,` dogs struckinwardly from said ring and adapted to bite into the pencil for securingthe cone thereon, a hollow turning knob integral with the ring andencircling the pencil, and resilient tongues on said knob forfrictionally gripping the pencil.

3. A pencil Sharpener of the character described comprising a plasticcone rotatably engageable with the writing end portion of a pencil, aspiral metallic strip embedded in the interior of the cone, tangentialteeth Struckfinwardlyirom the spiral metallic stripleaving openingstherein, the cone having tangential openings therein aligned with thefirst-named openings for the discharge of Shavings from the pencil, andmeans for retaining the cone on the pencil.

4. A pencil sharpener of the character described comprising a plasticcone rotatably en-I gageable with the Writing end-portionloffafpencilgia spiral metallic strip embedded in theinterior of the cone, tangentialteeth struck inwardly from the spiral metallic strip leavingopeningsthere-1v in, the cone having tangential openings-thereinaligned with therst-named openings for the discharge of shavings from the pencil, andmeans for retaining the cone on the pencil, said retaining meansincluding a cylindrical ring xed in the large end portion of the coneand adapted to encircle the pencil, and spiral series of dogs struckinwardly from said ring and adapted to bite into the pencil, said dogsbeing alternately arranged for preventing retrograde rotation of thecone on` the pencil and for preventingvsaid cone from slippinge'oi theWriting-end' of said pencil.

5. A pencil Sharpener of the character described comprising a plasticcone for rotatable engagement with the Writing end portion of a cone-andprojecting tangentially therein for cutting the pencilupon rotation ofsaid cone thereoiacylindrical-rin`g in the upper portion of the cone-forencircling the pencil, and dogs struck inwardly from said ring andadapted to bite into thelpe'ncil for -securi'ngthe :cone thereon.

WILLIAM MCCAULEY, JR.

